OK, I just pulled my Marchisio 11-19 9-speed sprockets off my wheels, and they literally fell apart in my fingers (well the adapter rings did anyway).
I see Campag still aren't doing an off the shelf 11-19.
Does anyone know of a quality third-party cassettes?
Yup. I replaced my Campag 9-speed 12-23 with a Miche 14-23 9-sp instead. I get more suitable gearing with this. See www.miche.it.
Mavic sell cassette kits (4 different ones) as well as individual sprockets (inside from 13 to 27; outside from 11-14, 16). Haven't tried these though.